

from __future__ import annotations

from collections.abc import Iterator
from typing import Any




class   UpperCamelCase			:

    def __init__(      self			:   Union[str, Any]				,     snake_case__			:   Optional[int]     ):

     """simple docstring"""






     SCREAMING_SNAKE_CASE		    =      data
     SCREAMING_SNAKE_CASE		    =      None




class   UpperCamelCase			:

    def __init__(      self			:   str     ):

     """simple docstring"""






     SCREAMING_SNAKE_CASE		    =      None
     SCREAMING_SNAKE_CASE		    =      None

    def __iter__(      self			:   Tuple     ):

     """simple docstring"""






     SCREAMING_SNAKE_CASE		    =      self.head
     while self.head:
      yield node.data
      SCREAMING_SNAKE_CASE		    =      node.next
      if node == self.head:
       break

    def __len__(      self			:   List[str]     ):

     """simple docstring"""






     return sum(1 for _ in self     )

    def __repr__(      self			:   Dict     ):

     """simple docstring"""






     return "->".join(str(_lowercase     ) for item in iter(self     )     )

    def UpperCamelCase      (      self			:   Optional[int]				,     snake_case__			:   Any     ):

     """simple docstring"""






     self.insert_nth(len(self     )				,     _lowercase     )

    def UpperCamelCase      (      self			:   List[Any]				,     snake_case__			:   Tuple     ):

     """simple docstring"""






     self.insert_nth(0				,     _lowercase     )

    def UpperCamelCase      (      self			:   Union[str, Any]				,     snake_case__			:   Dict				,     snake_case__			:   Optional[int]     ):

     """simple docstring"""






     if index < 0 or index > len(self     ):
      raise IndexError('list index out of range.'     )
     SCREAMING_SNAKE_CASE		    =      Node(_lowercase     )
     if self.head is None:
      SCREAMING_SNAKE_CASE		    =      new_node  # first node points itself
      SCREAMING_SNAKE_CASE		    =      new_node
     elif index == 0:  # insert at head
      SCREAMING_SNAKE_CASE		    =      self.head
      SCREAMING_SNAKE_CASE		    =      new_node
     else:
      SCREAMING_SNAKE_CASE		    =      self.head
      for _ in range(index - 1     ):
       SCREAMING_SNAKE_CASE		    =      temp.next
      SCREAMING_SNAKE_CASE		    =      temp.next
      SCREAMING_SNAKE_CASE		    =      new_node
      if index == len(self     ) - 1:  # insert at tail
       SCREAMING_SNAKE_CASE		    =      new_node

    def UpperCamelCase      (      self			:   Optional[Any]     ):

     """simple docstring"""






     return self.delete_nth(0     )

    def UpperCamelCase      (      self			:   Any     ):

     """simple docstring"""






     return self.delete_nth(len(self     ) - 1     )

    def UpperCamelCase      (      self			:   Optional[int]				,     snake_case__			:   Dict = 0     ):

     """simple docstring"""






     if not 0 <= index < len(self     ):
      raise IndexError('list index out of range.'     )
     SCREAMING_SNAKE_CASE		    =      self.head
     if self.head == self.tail:  # just one node
      SCREAMING_SNAKE_CASE		    =      None
     elif index == 0:  # delete head node
      SCREAMING_SNAKE_CASE		    =      self.tail.next.next
      SCREAMING_SNAKE_CASE		    =      self.head.next
     else:
      SCREAMING_SNAKE_CASE		    =      self.head
      for _ in range(index - 1     ):
       SCREAMING_SNAKE_CASE		    =      temp.next
      SCREAMING_SNAKE_CASE		    =      temp.next
      SCREAMING_SNAKE_CASE		    =      temp.next.next
      if index == len(self     ) - 1:  # delete at tail
       SCREAMING_SNAKE_CASE		    =      temp
     return delete_node.data




    def UpperCamelCase      (      self			:   Dict     ):

     """simple docstring"""






     return len(self     ) == 0


def 							__lowerCAmelCase     (							)		->				str:
 '''simple docstring'''


 SCREAMING_SNAKE_CASE		    =      CircularLinkedList()
 assert len(a__						) == 0
 assert circular_linked_list.is_empty() is True
 assert str(a__						) == ""

 try:
  circular_linked_list.delete_front()
  raise AssertionError  # This should not happen
 except IndexError:
  assert True  # This should happen

 try:
  circular_linked_list.delete_tail()
  raise AssertionError  # This should not happen
 except IndexError:
  assert True  # This should happen

 try:
  circular_linked_list.delete_nth(-1						)
  raise AssertionError
 except IndexError:
  assert True

 try:
  circular_linked_list.delete_nth(0						)
  raise AssertionError
 except IndexError:
  assert True

 assert circular_linked_list.is_empty() is True
 for i in range(5						):
  assert len(a__						) == i
  circular_linked_list.insert_nth(a__		,				i + 1						)
 assert str(a__						) == "->".join(str(a__						) for i in range(1		,				6						)						)

 circular_linked_list.insert_tail(6						)
 assert str(a__						) == "->".join(str(a__						) for i in range(1		,				7						)						)
 circular_linked_list.insert_head(0						)
 assert str(a__						) == "->".join(str(a__						) for i in range(0		,				7						)						)

 assert circular_linked_list.delete_front() == 0
 assert circular_linked_list.delete_tail() == 6
 assert str(a__						) == "->".join(str(a__						) for i in range(1		,				6						)						)
 assert circular_linked_list.delete_nth(2						) == 3

 circular_linked_list.insert_nth(2		,				3						)
 assert str(a__						) == "->".join(str(a__						) for i in range(1		,				6						)						)

 assert circular_linked_list.is_empty() is False


if __name__ == "__main__":
      import doctest

      doctest.testmod()




from __future__ import annotations


def 					_UpperCAmelCase				(						a__  ,	a__):

			'''simple docstring'''



			a_						:						List[str] 							= 0
			a_						:						str 							= len(a__) - 1

			while i < j:
						if nums[i] + nums[j] == target:
									return [i, j]
						elif nums[i] + nums[j] < target:
									a_						:						List[Any] 							= i + 1
						else:
									a_						:						Optional[Any] 							= j - 1

			return []


if __name__ == "__main__":
	import doctest

	doctest.testmod()
	print(F"""{two_pointer([2, 7, 11, 15], 9) = }""")


